auxin
Sign in to saveAuxins (plural of auxin ) are a class of plant hormones (or plant-growth regulators) with some morphogen-like characteristics. Auxins play a cardinal role in coordination of many growth and behavioral processes in plant life cycles and are essential for plant body development. The Dutch biologist Frits Warmolt Went first described auxins and their role in plant growth in the 1920s. Kenneth V. Thimann became the first to isolate one of these phytohormones and to determine its chemical structure as indole-3-acetic acid (IAA). Went and Thimann co-authored a book on plant hormones, Phytohormones,
AI overview
Auxins are natural chemical messengers in plants that act as growth regulators, controlling how plants grow and develop throughout their lives. Scientists first discovered these important hormones in the 1920s, and they're essential for coordinating many of the processes that shape how plants look and behave.
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Article
26 sectionsContents
- Overview
- Discovery
- Charles Darwin
- Peter Boysen Jensen
- Frits Went
- Hormonal activity
- Molecular mechanisms
- Perception
- Aux/IAA and ARF signalling modules
- On a cellular level
- Organ patterns
- Auxin transport and the uneven distribution of auxin
- Organization of the plant
- Locations
- Effects
- Wound response
- Root growth and development
- Apical dominance
- Fruit growth and development
- Flowering
- Ethylene biosynthesis
- Synthetic auxins
- Herbicide manufacture
- See also
- References
- Further reading
Auxins (plural of auxin ) are a class of plant hormones (or plant-growth regulators) with some morphogen-like characteristics. Auxins play a cardinal role in coordination of many growth and behavioral processes in plant life cycles and are essential for plant body development. The Dutch biologist Frits Warmolt Went first described auxins and their role in plant growth in the 1920s. Kenneth V. Thimann became the first to isolate one of these phytohormones and to determine its chemical structure as indole-3-acetic acid (IAA). Went and Thimann co-authored a book on plant hormones, Phytohormones, in 1937.
==Overview== Auxins were the first of the major plant hormones to be discovered. They derive their name from the Greek word ( – 'to grow/increase'). Auxin is present in all parts of a plant, although in very different concentrations. The concentration in each position is crucial developmental information, so it is subject to tight regulation through both metabolism and transport. The result is the auxin creates "patterns" of auxin concentration maxima and minima in the plant body, which in turn guide further development of respective cells, and ultimately of the plant as a whole.